@article{MAN_1972__198_162298,
     author = {Dieter Pumpl\"un},
     title = {Universelle und spezielle {Probleme.}},
     journal = {Mathematische Annalen},
     pages = {131--146},
     publisher = {mathdoc},
     volume = {198},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__198_162298/}
}